How are engineering companies addressing the issue of energy efficiency?

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Focussing Questions:

•When is 'energy efficiency' important?•What is 'energy efficiency' to a project developer? •What is the measure of 'energy efficiency'?

•How does this impact on technology selection?

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When is 'energy efficiency' important?•Limited or very high cost energy (water) supply•Good corporate citizenship•Operating costs optimisation•Optionality – unreliable and multiple supply systems

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What is 'energy efficiency' in project development?

•Process selection - particularly comminution•High efficiency drives•High efficiency lighting•Optimised materials handling (trucking, conveying and pumping)•Optimised elevations•Water recovery efficiency – (water can cost $4/m3)

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What is the measure of 'energy efficiency'?

$ cashflow, NPV, ROV

• Energy cost and supply risks are factored in• Corporate 'good citizen' policies are considered

• kWh/t ore processed?• kWh/t metal produced?• t CO2/t ore produced (including inherent energy)?• t CO2/t metal produced (including inherent energy)?

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Ingenuity & insight – the Ausenco group

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A cycle•Need•Idea•Innovation •Cost reduction

•Paradigm shift (only when cost effective)

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Why doesn’t every one drive a Prius?

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Energy efficient operation Cost inefficient

(unless you are a taxi operator)

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Conclusions•Energy efficiency is a sub-set of cost effectiveness•The key driving forces are commercial

– Energy costs– Energy supply limitations– Revenue implications

•To optimise energy efficiency requires a 'business optimisation perspective'

Thank you

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